title: A single-shot common-path phase-stepping radial shearing interferometer for wavefront measurements.
abstract: A single-shot common-path phase-stepping radial shearing interferometer (RSI) is proposed for wavefront measurements. In the proposed RSI, three quarter-wave plates are used as phase shifters to produce four spatially separated phase-stepping fringe patterns that are recorded simultaneously by a single CCD camera. The proposed RSI can measure the wavefront under test in real-time, and it is also insensitive to environmental vibration due to its common-path structure. Experimentally the proposed RSI is applied to detect the distorted wavefronts generated by a liquid crystal spatial light modulator. The measured aberrations are in good agreement with that obtained with (by) a Hartmann-Shack wavefront sensor, indicating that the proposed RSI is a useful tool for wavefront measurements.
authors.affiliation: The Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, 610209, China. gnt7328@163.com
authors.forename: Naiting
authors.initials: N
authors.lastname: Gu
authors.forename: Linhai
authors.initials: L
authors.lastname: Huang
authors.forename: Zeping
authors.initials: Z
authors.lastname: Yang
authors.forename: Changhui
authors.initials: C
authors.lastname: Rao
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007368:Interferometry / Q000295:instrumentation*; D010783:Photometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*